Sheave-block.



IATENTED JAN. 1905.

VNiTnio STATES Patented January 17, 1905 lPr-TTILNT GFFICE.

SHEAVE-BLOCK.

SPECIFICATION forming part of Letters Patent No. I702550,28@ dated J'anuary 17, 1905.

Application filed Juno 18, 1904. Serial No. 213,126.

To all whom it may concern:

Be it known that I, HERBERT GILLEY, a citizen of the vDominion oi'Canada, residing at New Vestminster, in the Province of BritishColumbia, Canada, have invented a new and useful Improvement in SheaveBlocks, oi' which the following is a speciiication.

This invention relates to an improved sheaveblock designed to supportthe wire rope of a log-haul, in which work a block is exposed to verysevere duty not only in the rough usa-ge to which it is generallysubjected, but also in the wear to which the groove oiE the sheaveitself is exposed from the wire rope and in the long-sustained frictionwhich its axle-bearing has to endure. rIhese conditions render the useot' an ordinary pulley-sheave prohibitory, as they are not designed forlong-sustained or heavy work and wear out rapidly, and my improvementshave been directed to adapting the design ot' the block to the use ofmaterial which will stand the rough treat-V ment and to the provisionot' the shoave-bearings in the side frames of the block instead oi', ascustomary, allowing' the sheave to run on a pin fixed in the sideframes, by which change a greater bearingsuriace is provided and meansfor etlieient lubrication may be introduced which otherwise would not beattainable. In the development of this construction I am enabled to casta sheave ot' white iron having a chilled groove on an axle oi' rolledsteel, which forms a comparatively cheap combination ot' two materialseminently iitted to the character of the wear the parts are required toendure and which could not otherwise be obtained readily owing to thedii'liculty ot' machining the hard cast-iron. The construction by whichI attain these results is fully set forth in the following specitication, and illustrated in the drawings which accompany it.

Figure 1 is a vertical section through 'the pulley-frames and pulley;Fig. 2, a side elevation oiI the same, and Figs. 3 and 4 similar viewsof an alternative construction in which the design is modified to suitthe requirements of the use of cast-steel for the sheave-i`rames.

In the drawings the sheave or pulley is represented by 2 and is oi'white iron east on a riphery ot' the sheave.

chill, with the axle 3, of rolled steel, in place, due care beingl takento insure that the position ot' the axle is maintained true to the pe-In the design illustrated in Figs. l and 2 the side frames 4 are made ofwrought iron or steel plate. The upper ends, through which the bolt 5 ispassed, which connects the link or shackle by which the sheave-block issuspended to a post or convenient, tree are t'olded inward, as shown at6, to better support the pin, and at the opposite or lower end the sidesi are secured together by bolts 7, short sleeves 8 being provided asdistance-pieces- On the outer side of each side plate toward the middle,bearingblocks 9, ot cast-iron, are riveted, and a hole large enough toallow an ample babbitt bearing 10 for the axle oi" the sheave isprovided through the side plates 4f and the blocks 9. On the upper innerside of each bcaring-block a recess 11 is cored, so that when the blockis riveted to the plate an oil-box is `formed conn municating with thebearing by an oil-hole 12. In use the oil-box may be iilled with waste,which will retain the oil and prevent it running too freely through thebearing, and

with this provision a simple, comparatively cheap, and thoroughlyel'iicient sheave-block is provided for log-hauling purposes adapted tothe heavy work required from such without the continuous attention ioroiling and renewal which those in common use require.

The n'lodiiication shown in Figs. 3 and i is merely the adaptation ot'the same principles to the use cil cast-steel or similar material. Thebearing-boxes 11,5, with the oil-boxes ll and the distancepieces, Snc.,are cast in one with the side plates 16 and the conformation oi" theparts varied to suit such adaptation.

Having now particularly described my invention, I declare that what Iclaim as new, and desire to be protected in by Letters Patent, is-

1. A sheave-block having a grooved sheave with an axle-pin fixedtherein; side plates ot' approximately rectangular `form iolded overinwardly at the upper ends to receive a pin for connecting the platesand suspending the block, means for connecting the plates at the lowerend, and babbitted bearings secured on the Side plates having oil-boxeson their up- In testimony whereoflhavesigned my name per sides. to thisspecification in the presence of two Sub- IO 2. A sheave-hloek having aChilled-groove scrbing Witnesses. A Sheave cast on its axle-pin, sldeplates having HERBERT GILLEY.

5 babbitted bearings provided at their upper sides with oil-boxes andmeans for securing In presence ofthe plates together at the requireddistance, ELLICE VVEBBER, apart and for suspending the block. ROWLANDBRITTAIN.

